What exactly do they think humans will be hunting? The large mammals will go extinct in the process of 8+billion falling to hunter gatherer population levels if agriculture goes bye bye. Also heating the earth doesnt have the same effects as the ice age era in terms of making ag nonviable. Cold is much worse than warm.
Collapse
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This is the place for discussing the potential collapse of modern civilization and the environment.
Collapse, in this context, refers to the significant loss of an established level or complexity towards a much simpler state. It can occur differently within many areas, orderly or chaotically, and be willing or unwilling. It does not necessarily imply human extinction or a singular, global event. Although, the longer the duration, the more it resembles a ‘decline’ instead of collapse.
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I expect they mean the far future, where the ecosystem can recover. Large mammals will be gone almost immediately, but rodent-sized animals will survive, and their size can increase over relatively short (evolutionary speaking) time scale.